What’s Vulnerable › Vulnerabilities

CVE-2021-28994

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 2.0% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2021-03-31 · updated 2026-06-17
• Weakness: CWE-770

Description

kopano-ical (formerly zarafa-ical) in Kopano Groupware Core through 8.7.16, 9.x through 9.1.0, 10.x through 10.0.7, and 11.x through 11.0.1 and Zarafa 6.30.x through 7.2.x allows memory exhaustion via long HTTP headers.

Affected products

• Kopano Groupware Core: through 8.7.16; from 9.0.0 through 9.1.0; from 10.0.0 through 10.0.7; from 11.0.0 through 11.0.1
• Zarafa: from 6.30.0 through 7.2.6

References

• http://www.openwall.com/lists/oss-security/2021/04/01/1
• http://www.openwall.com/lists/oss-security/2021/04/25/1
• https://www.openwall.com/lists/oss-security/2021/03/19/6
• http://www.openwall.com/lists/oss-security/2021/04/01/1
• http://www.openwall.com/lists/oss-security/2021/04/25/1
• https://www.openwall.com/lists/oss-security/2021/03/19/6

Get alerted when CVE-2021-28994 or the next vulnerability affects your stack